US6169636B1 - Focus corrector for zoom projection lenses used with pixelized panels - Google Patents
Focus corrector for zoom projection lenses used with pixelized panels Download PDFInfo
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- US6169636B1 US6169636B1 US09/383,778 US38377899A US6169636B1 US 6169636 B1 US6169636 B1 US 6169636B1 US 38377899 A US38377899 A US 38377899A US 6169636 B1 US6169636 B1 US 6169636B1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
Definitions
- This invention relates to projection lenses and, in particular, to zoom projection lenses which can be used, inter alia, to form an image of an object composed of pixels, e.g., an LCD, a reflective LCD, a DMD, or the like.
- pixels e.g., an LCD, a reflective LCD, a DMD, or the like.
- Telecentric lenses are lenses which have at least one pupil at infinity.
- having a pupil at infinity means that the principal rays are parallel to the optical axis (a) in object space, if the entrance pupil is at infinity, or (b) in image space, if the exit pupil is at infinity. Since light can propagate through a lens in either direction, the pupil at infinity can serve as either an entrance or an exit pupil depending upon the lens' orientation with respect to the object and the image. Accordingly, the term “telecentric pupil” will be used herein to describe the lens' pupil at infinity, whether that pupil is functioning as an entrance or an exit pupil.
- the telecentric pupil need not actually be at infinity since a lens having an entrance or exit pupil at a sufficiently large distance from the lens' optical surfaces will in essence operate as a telecentric system.
- the principal rays for such a lens will be substantially parallel to the optical axis and thus the lens will in general be functionally equivalent to a lens for which the theoretical (Gaussian) location of the pupil is at infinity.
- the terms “telecentric” and “telecentric lens” are intended to include lenses which have at least one pupil at a long distance from the lens' elements, and the term “telecentric pupil” is used to describe such a pupil at a long distance from the lens' elements.
- the telecentric pupil distance will in general be at least about 10 times the lens' focal length.
- Projection lens systems are used to form an image of an object on a viewing screen. Such systems can be of the front projection or rear projection type, depending on whether the viewer and the object are on the same side of the screen (front projection) or on opposite sides of the screen (rear projection).
- FIG. 2 The basic structure of such a system is shown in FIG. 2, where 10 is a light source (e.g., a tungsten-halogen lamp), 12 is illumination optics which forms an image of the light source (hereinafter referred to as the “output” of the illumination system), 14 is the object which is to be projected (e.g., an LCD matrix of on and off pixels), and 13 is a projection lens, composed of multiple lens elements, which forms an enlarged image of object 14 on viewing screen 16 .
- the system can also include a field lens unit, e.g., a Fresnel lens, in the vicinity of the pixelized panel to appropriately locate the exit pupil of the illumination system.
- a field lens unit e.g., a Fresnel lens
- a mirror is often used to fold the optical path and thus reduce the system's overall size.
- Projection lens systems in which the object is a pixelized panel are used in a variety of applications. Such systems preferably employ a single projection lens which forms an image of, for example, a single panel having red, green, and blue pixels. In some cases, e.g., large image rear projection systems, multiple panels and multiple projection lenses are used, with each panel/projection lens combination producing a portion of the overall image. In either case, projection lenses used with such systems generally need to have a relatively long back focal length to accommodate the prisms, beam splitters, color wheels, etc. normally used with pixelized panels.
- microdisplays e.g., front projection systems which are used to display data and rear projection systems which are used as computer monitors.
- DMDs digital light valve devices
- LCDs digital light valve devices
- Projection displays based on these devices offer advantages of small size and light weight. As a result, a whole new class of ultra portable lightweight projectors operating in front-projection mode and employing digital light valves has appeared on the market. Lightweight compact rear-projection systems can also be achieved through the use of these devices.
- these devices To display images having a high information content, these devices must have a large number of pixels. Since the devices themselves are small, the individual pixels are small, a typical pixel size ranging from 17 ⁇ for DMD displays to approximately 8 ⁇ or even less for reflective LCDs. This means that the projection lenses used in these systems must have a very high level of correction of aberrations. Of particular importance is the correction of chromatic aberrations and distortion.
- a high level of chromatic aberration correction is important because color aberrations can be easily seen in the image of a pixelized panel as a smudging of a pixel or, in extreme cases, the complete dropping of a pixel from the image. These problems are typically most severe at the edges of the field.
- a small amount of (residual) lateral color can be compensated for electronically by, for example, reducing the size of the image produced on the face of the red CRT relative to that produced on the blue CRT.
- CRTs cathode ray tubes
- the above-mentioned microdisplays typically require that the light beam from the illumination system has a near-normal angle of incidence upon the display.
- this translates into a requirement that the lens has a telecentric entrance pupil, i.e., the projection lens must be telecentric in the direction of its short imaging conjugate where the object (pixelized panel) is located. This makes the lens asymmetric about the stop which makes the correction of lateral color more difficult.
- the ability of a projection lens to operate efficiently over a range of focal lengths is desirable since it allows the projection system to be used with screens of different sizes and halls of different dimensions without the need to change any of the components of the system.
- the challenge is to maintain a high level of aberration correction throughout the operative range of focal lengths without unduly complicating the lens design.
- the invention provides a projection lens for forming an image of an object, said lens having a zoom range between a minimum effective focal length f min and a maximum effective focal length f max , said lens consisting in order from its image end (long conjugate or screen end) to its object end (short conjugate or pixelized panel end) of:
- the second lens unit consists in order from its image end to its object end of:
- the first lens subunit has less lens elements than the second lens subunit.
- the first lens subunit is a singlet.
- the first lens subunit preferably has less optical power than the second lens subunit.
- the projection lenses of the invention can be designed using the location of the output of the illumination system as a pseudo-aperture stop/entrance pupil of the projection lens (see the above-referenced Betensky patent). In this way, efficient coupling is achieved between the light output of the illumination system and the projection lens.
- FIG. 1 is a schematic side view of a representative projection lens constructed in accordance with the invention.
- FIG. 2 is a schematic diagram showing an overall projection lens system in which the projection lenses of the present invention can be used.
- the projection lenses of the present invention are of the retrofocus or the inverted telephoto type and consist of two lens units, i.e., a negative unit (U 1 ) on the long conjugate side and a positive unit (U 2 ) on the short conjugate side, which are typically separated by an aperture stop or a pseudo-aperture stop.
- this overall lens form to produce an image of a pixelized panel has various advantages.
- telecentricity is readily achieved by locating the lens' aperture stop or pseudo-aperture stop in the front focal plane of the second positive unit.
- Additional advantages are a long back focal length and the ability to handle a wide field of view. Both of these characteristics are particularly useful in rear projection systems, where the lens must have a wide field of view to achieve the smallest possible overall package size, and where there is a need to accommodate beam splitting prisms between the lens and the pixelized panel.
- These prisms may include polarizing beam splitters, as well as color splitting prisms.
- the lenses of the invention achieve a high level of distortion correction by using one or more aspherical surfaces in the first lens unit. Some residual distortion, as well as spherical aberration of the lens' entrance pupil, is corrected through the use of one or more aspherical surfaces in the second lens unit.
- the spherical aberration of the entrance pupil should be minimized to achieve telecentricity for any arbitrary point in the object plane of the lens.
- the aspherical surfaces are formed on plastic lens elements.
- the most critical aberration that must be corrected is the lens' lateral color.
- Various preferred approaches for correcting this aberration are disclosed in the '693 application. As noted above, although preferred, these approaches need not be used in the practice of the present invention.
- Zooming of the projection lenses of the invention is achieved by moving the first and second lens units relative to one another.
- the units are coupled together mechanically so that both units move together relative to the pixelized panel (see Space 3 in Tables 1-3), and at the same time, the units move relative to one another (see Space 1 in Tables 1-3).
- the focus of the lens would be adjusted by moving the first lens unit, i.e., by a further (second) adjustment of Space 1 in Tables 1-3.
- the first lens subunit of the second lens unit is moved for this purpose rather than the first lens unit, i.e., Space 2 in Tables 1-3 is adjusted rather than Space 1.
- the first lens subunit typically has less lens elements, has a smaller diameter (smaller maximum clear aperture), and a shorter length than the first lens unit. Having less elements and a smaller diameter means that the first lens subunit has less mass than the first unit. Accordingly, it is easier to move this lens subunit using, for example, a motorized drive than to move the first lens unit.
- cam mechanisms and motorized drives can be used to move the lens and/or its component parts during focusing and zooming.
- FIG. 1 and Tables 1-3 illustrate representative projection lenses constructed in accordance with the invention.
- the prescription of Table 1 is preferred.
- HOYA designations are used for the various glasses employed in the lens systems.
- Equivalent glasses made by other manufacturers e.g., OHARA or SCHOTT
- Industry acceptable materials are used for the plastic elements.
- z is the surface sag at a distance y from the optical axis of the system
- c is the curvature of the lens at the optical axis
- k is a conic constant, which is zero except where indicated in the prescriptions of Tables 1-3.
- the designation “a” associated with various surfaces in the tables represents an aspherical surface, i.e., a surface for which at least one of D, E, F, G, H, or I in the above equation is not zero; and the designation “c” indicates a surface for which k in the above equation is not zero.
- the various planar structures located on the short conjugate side of U 2 in the figure and tables represent components which are used with or are a part of the pixelized panel. They do not constitute part of the projection lens. All dimensions given in the tables are in millimeters.
- the prescription tables are constructed on the assumption that light travels from left to right in the figures. In actual practice, the viewing screen will be on the left and the pixelized panel will be on the right, and light will travel from right to left. In particular, the references in the prescription tables to objects/images and entrance/exit pupils are reversed from that used in the rest of the specification.
- the pixelized panel is shown in FIG. 1 by the designation “PP” and the equivalent physical aperture stop is shown by the designation “AS”.
- the zoom projection lenses of the examples were designed using the pseudo-aperture stop/entrance pupil technique of Betensky, U.S. Pat. No. 5,313,330.
- the illumination system is used to define the entrance pupil for the projection lens, with the entrance pupil being located at a constant position relative to the pixelized panel for all lens focal lengths and conjugates. The location of this pupil is determined by the substantially parallel light (substantially telecentric light) which passes through the pixelized panel from the illumination system.
- the pseudo-aperture stop/entrance pupil is surface 24 . The image of this surface by the second lens unit places the equivalent physical aperture stop (AS) between the first and second lens units as illustrated in FIG. 1 .
- AS equivalent physical aperture stop
- the zoom lens of Table 1 has the following properties at its short focal length position:
- pixel size is pixel width
- BFL is back focal length
- f 0 is effective focal length of the lens.
- Tables 2 and 3 have similar properties.
- the zoom projection lenses of the invention will have some and preferably all of the following properties:
- the lens has a half field of view in the direction of the image of at least 20° and preferably at least 25°;
- the lateral color blur of the lens at its full field for wavelengths in the range from 460 nanometers to 620 nanometers is less than a pixel and preferably less than three-quarters of a pixel (note that the level of lateral color correction can be determined at the object plane or the image plane, a magnified pixel being used when the determination is performed at the image plane);
- the distortion of the lens is less than 1.5 percent and preferably less than or equal to 1.0 percent;
- the ratio of the lens's back focal length (BFL) to its focal length is greater than 0.7, preferably greater than 1.0, and most preferably greater than or equal to 1.5;
- HT ⁇ 1400.0 f/ 2.81 MAG: ⁇ 0.0220 STOP: 0.00 after surface 24.
- DIA ⁇ 11784.
- EFL 73.8712 FVD: 400.404
- ENP 47.6042
- IMD 0.394117 BRL: 400.010
- EXP 32579.3
- OBD ⁇ 3310.01
- OVL 3710.42
- HT ⁇ 4800.0 f/ 2.81 MAG: ⁇ 0.0064 STOP: 0.00 after surface 24.
- DIA ⁇ 11788.
- HT ⁇ 960.00 f/ 2.81 MAG: ⁇ 0.0321 STOP: 0.00 after surface 24.
- DIA ⁇ 11790.
- EFL 51.3237 FVD: 446.536
- ENP 67.9925
- IMD 0.408276
- BRL 446.127
- EXP 32579.3
- OBD ⁇ 1530.80
- OVL 1977.33
- HT ⁇ 890.00 f/ 2.81 MAG: ⁇ 0.0346 STOP: 0.00 after surface 24.
- DIA ⁇ 11788.
- HT ⁇ 1400.0 f/ 2.81 MAG: ⁇ 0.0220 STOP: 0.00 after surface 24.
- DIA ⁇ 11282.
- EFL 73.2246
- FVD 402.540
- IMD 47.8756
- IMD 0.399977
- BRL 402.140
- EXP 32579.3
- OBD ⁇ 3280.35
- OVL 3682.89
- HT ⁇ 4800.0 f/ 2.81 MAG: ⁇ 0.0064 STOP: 0.00 after surface 24.
- DIA ⁇ 11784.
- HT ⁇ 960.00 f/ 2.81 MAG: ⁇ 0.0321 STOP: 0.00 after surface 24.
- DIA ⁇ 11786.
- EFL 51.1377 FVD: 446.518
- ENP 67.3953
- IMD 0.398357
- BRL 446.119
- EXP 32579.3
- OBD ⁇ 1525.60
- OVL 1972.12
- HT ⁇ 890.00 f/ 2.93 MAG: ⁇ 0.0346 STOP: 0.00 after surface 24.
- DIA ⁇ 11285.
- EFL 73.3284 FVD: 402.541
- ENP 47.5641
- IMD 0.400345
- BRL 402.140
- EXP 32579.3
- OBD ⁇ 2071.59
- OVL 2474.13
- Object Height ⁇ 1500.0 ⁇ 1400.0 ⁇ 1400.0 ⁇ 4800.0 ⁇ 4640.0 ⁇ 960.00 ⁇ 890.00
- Object Distance ⁇ 2256.9 ⁇ 2714.1 ⁇ 3280.4 ⁇ 7923.0 ⁇ 11027.
- HT ⁇ 1400.0 f/ 2.93 MAG: ⁇ 0.0220 STOP: 0.00 after surface 24.
- DIA ⁇ 11285.
- EFL 71.2712 FVD: 402.541
- ENP 49.2460
- IMD 0.400403
- BRL 402.140
- EXP 32579.3
- OBD ⁇ 3190.20
- OVL 3592.74
- HT ⁇ 4800.0 f/ 2.81 MAG: ⁇ 0.0064 STOP: 0.00 after surface 24.
- DIA ⁇ 11787.
- HT ⁇ 960.00 f/ 2.81 MAG: ⁇ 0.0321 STOP: 0.00 after surface 24.
- DIA ⁇ 11789.
- EFL 51.1831 FVD: 446.517
- ENP 67.4104
- IMD 0.397928 BRL: 446.119
- EXP 32579.3 OBD: ⁇ 1527.00 OVL: 1973.52
- HT ⁇ 890.00 f/ 2.93 MAG: ⁇ 0.0346 STOP: 0.00 after surface 24.
- DIA ⁇ 11288.
- EFL 71.3321 FVD: 402.541 ENP: 48.9803 IMD: 0.400167 BRL: 402.140 EXP: 32579.3 OBD: ⁇ 2012.48 OVL: 2415.02 First ⁇ Order Data Zoom/Focus Position 1 2 3 4 5 6 7 f/number 2.81 2.87 2.93 2.81 2.93 2.81 2.93 Magnification ⁇ 0.0220 ⁇ 0.0220 ⁇ 0.0220 ⁇ 0.0064 ⁇ 0.0066 ⁇ 0.0321 ⁇ 0.0346 Object Height ⁇ 1500.0 ⁇ 1400.0 ⁇ 1400.0 ⁇ 4800.0 ⁇ 4640.0 ⁇ 960.00 ⁇ 890.00 Object Distance ⁇ 2259.3 ⁇ 2714.1 ⁇ 3190.2 ⁇ 7933.3 ⁇ 10738.
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Abstract
Description
TABLE 1 | ||||||
Surf. | Clear Aperture | |||||
No. | Type | Radius | Thickness | Glass | Diameter | |
1 | a | 316.4987 | 9.00000 | ACRYLIC | 106.50 | |
2 | ac | 48.5107 | 79.22000 | 83.70 | ||
3 | −68.2336 | 4.10000 | FCD1 | 53.00 | ||
4 | 290.7899 | 7.00000 | TAF3 | 53.00 | ||
5 | −157.0756 | Space 1 | 52.00 | |||
6 | 154.9494 | 8.14000 | FD60 | 54.20 | ||
7 | 758.2655 | Space 2 | 55.40 | |||
8 | −1067.2049 | 8.92000 | FCD1 | 65.80 | ||
9 | −119.5453 | 13.48000 | 67.20 | |||
10 | −78.2658 | 6.00000 | FD5 | 68.80 | ||
11 | 158.5274 | 13.50000 | FCD1 | 77.70 | ||
12 | −158.5274 | 0.10000 | 79.90 | |||
13 | 139.1541 | 16.70000 | FCD1 | 88.00 | ||
14 | −176.7399 | 35.55000 | 88.60 | |||
15 | 112.2150 | 19.30000 | FCD1 | 89.00 | ||
16 | −157.8763 | 0.90000 | 88.00 | |||
17 | −217.6579 | 8.00000 | FEL6 | 85.70 | ||
18 | 217.6579 | 8.72000 | 80.50 | |||
19 | a | −1204.7930 | 9.00000 | ACRYLIC | 79.90 | |
20 | −266.7334 | Space 3 | 79.70 | |||
21 | ∞ | 17.00000 | 80.00 | |||
22 | ∞ | 55.00000 | BSC7 | 80.00 | ||
23 | ∞ | 32580.94922 | 70.00 | |||
24 | Aper. stop | −32580.94922 | 12029.19 | |||
25 | ∞ | 0.00000 | 70.00 | |||
26 | ∞ | 2.50000 | BSC7 | 70.00 | ||
27 | ∞ | Image distance | 70.00 | |||
Symbol Description |
a - Polynomial asphere |
c - Conic section |
Even Polynomial Aspheres and Conic Constants |
Surf. | ||||||||
No. | k | D | E | F | G | H | I | |
1 | −3.7810E − 08 | 3.8833E − 11 | 4.3571E − 15 | −1.0785E − 18 | −3.9211E − 22 | 6.9576E − 26 | ||
2 | −1.2000E + 00 | 4.3607E − 07 | 1.0988E − 10 | −3.6564E − 14 | 2.5559E − 17 | 1.2829E − 20 | −7.5081E − 24 | |
19 | −7.7096E − 07 | −5.1172E − 11 | −2.0446E − 14 | 1.5579E − 17 | −2.9214E − 21 | −7.1999E − 25 | ||
Variable Spaces |
Zoom/Focus | Space 1 | Space 2 | Space 3 | Focal | Image | |
Pos. | T(5) | T(7) | T(20) | Shift | Distance | |
1 | 78.612 | 26.342 | 19.043 | −0.064 | 0.408 | |
2 | 40.873 | 26.342 | 30.135 | −0.088 | 0.401 | |
3 | 7.086 | 26.342 | 44.452 | −0.089 | 0.394 | |
4 | 78.612 | 27.165 | 18.223 | −0.083 | 0.406 | |
5 | 7.086 | 27.457 | 43.334 | −0.052 | 0.390 | |
6 | 78.612 | 25.832 | 19.554 | −0.074 | 0.408 | |
7 | 7.086 | 25.415 | 45.379 | −0.106 | 0.399 | |
POS 1 System First Order Properties |
OBJ. HT: −1500.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11789. |
EFL: 51.3345 | FVD: 446.536 | ENP: 68.0696 | ||
IMD: 0.408490 | BRL: 446.127 | EXP: 32579.3 | ||
OBD: −2265.24 | OVL: 2711.77 | |||
POS 2 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11791. |
EFL: 61.1831 | FVD: 419.881 | ENP: 59.1300 | ||
IMD: 0.400794 | BRL: 419.480 | EXP: 32579.3 | ||
OBD: −2721.80 | OVL: 3141.68 | |||
POS 3 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11784. |
EFL: 73.8712 | FVD: 400.404 | ENP: 47.6042 | ||
IMD: 0.394117 | BRL: 400.010 | EXP: 32579.3 | ||
OBD: −3310.01 | OVL: 3710.42 | |||
POS 4 System First Order Properties |
OBJ. HT: −4800.0 | f/ 2.81 MAG: | −0.0064 |
STOP: 0.00 after surface 24. DIA: −11788. |
EFL: 51.3519 | FVD: 446.536 | ENP: 68.1940 | ||
IMD: 0.405961 | BRL: 446.130 | EXP: 32579.3 | ||
OBD: −7955.46 | OVL: 8401.99 | |||
POS 5 System First Order Properties |
OBJ. HT: −4640.0 | f/ 2.81 MAG: | −0.0066 |
STOP: 0.00 after surface 24. DIA: −11780. |
EFL: 73.7874 | FVD: 400.398 | ENP: 47.9533 | ||
IMD: 0.390076 | BRL: 400.008 | EXP: 32579.3 | ||
OBD: −11131.8 | OVL: 11532.2 | |||
POS 6 System First Order Properties |
OBJ. HT: −960.00 | f/ 2.81 MAG: | −0.0321 |
STOP: 0.00 after surface 24. DIA: −11790. |
EFL: 51.3237 | FVD: 446.536 | ENP: 67.9925 | ||
IMD: 0.408276 | BRL: 446.127 | EXP: 32579.3 | ||
OBD: −1530.80 | OVL: 1977.33 | |||
POS 7 System First Order Properties |
OBJ. HT: −890.00 | f/ 2.81 MAG: | −0.0346 |
STOP: 0.00 after surface 24. DIA: −11788. |
EFL: 73.9411 | FVD: 400.409 | ENP: 47.3132 | ||
IMD: 0.399310 | BRL: 400.010 | EXP: 32579.3 | ||
OBD: −2089.54 | OVL: 2489.95 | |||
First−Order Data |
Zoom/Focus Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
f/number | 2.81 | 2.81 | 2.81 | 2.81 | 2.81 | 2.81 | 2.81 |
Magnification | −0.0220 | −0.0220 | −0.0220 | −0.0064 | −0.0066 | −0.0321 | −0.0346 |
Object Height | −1500.0 | −1400.0 | −1400.0 | −4800.0 | −4640.0 | −960.00 | −890.00 |
Object Distance | −2265.2 | −2721.8 | −3310.0 | −7955.5 | −11132. | −1530.8 | −2089.5 |
Effective Focal Length | 51.335 | 61.183 | 73.871 | 51.352 | 73.787 | 51.324 | 73.941 |
Image Distance | 0.40849 | 0.40079 | 0.39412 | 0.40596 | 0.39008 | 0.40828 | 0.39931 |
Overall Length | 2711.8 | 3141.7 | 3710.4 | 8402.0 | 11532. | 1977.3 | 2490.0 |
Forward Vertex Distance | 446.54 | 419.88 | 400.40 | 446.54 | 400.40 | 446.54 | 400.41 |
Barrel Length | 446.13 | 419.48 | 400.01 | 446.13 | 400.01 | 446.13 | 400.01 |
Stop Surface Number | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
Distance to Stop | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Stop Diameter | −11789.348 | −11791.152 | −11784.277 | −11787.995 | −11780.033 | −11790.147 | −11787.969 |
Entrance Pupil Distance | 68.070 | 59.130 | 47.604 | 68.194 | 47.953 | 67.993 | 47.313 |
Exit Pupil Distance | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. |
First Order Properties of Elements |
Element | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 2 | −0.84925E − 02 | −117.75 | |
2 | 3 | 4 | −0.90534E − 02 | −110.46 | |
3 | 4 | 5 | 0.78703E − 02 | 127.06 | |
4 | 6 | 7 | 0.41980E − 02 | 238.21 | |
5 | 8 | 9 | 0.37141E − 02 | 269.25 | |
6 | 10 | 11 | −0.13065E − 01 | −76.539 | |
7 | 11 | 12 | 0.61994E − 02 | 161.31 | |
8 | 13 | 14 | 0.62897E − 02 | 158.99 | |
9 | 15 | 16 | 0.74185E − 02 | 134.80 | |
10 | 17 | 18 | −0.49410E − 02 | −202.39 | |
11 | 19 | 20 | 0.14407E − 02 | 694.10 | |
First−Order Properties of Doublets |
Element | Surface | ||||||
Numbers | Numbers | Power | f′ | ||||
2 | 3 | 3 | 5 | −0.84544E − 03 | −1182.8 | |||
6 | 7 | 10 | 12 | −0.63038E − 02 | −158.64 | |||
First Order Properties of Groups |
Group | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 5 | −0.95858E − 02 | −104.32 | |
2 | 6 | 7 | 0.41980E − 02 | 238.21 | |
3 | 8 | 20 | 0.75751E − 02 | 132.01 | |
First Order Properties of the Lens |
Zoom/Focus Position | |||
Number | Power | f′ | |
1 | 0.19480E − 01 | 51.335 | |
2 | 0.16344E − 01 | 61.183 | |
3 | 0.13537E − 01 | 73.871 | |
4 | 0.19473E − 01 | 51.352 | |
5 | 0.13552E − 01 | 73.787 | |
6 | 0.19484E − 01 | 51.324 | |
7 | 0.13524E − 01 | 73.941 | |
TABLE 2 | ||||||
Surf. | Clear Aperture | |||||
No. | Type | Radius | Thickness | Glass | Diameter | |
1 | a | 256.2114 | 9.00000 | ACRYLIC | 104.16 | |
2 | ac | 46.6427 | 71.04216 | 81.05 | ||
3 | −68.5819 | 4.10000 | FCD1 | 54.77 | ||
4 | 230.5086 | 8.00000 | TAF3 | 54.54 | ||
5 | −172.4161 | Space 1 | 54.45 | |||
6 | 170.1619 | 8.14000 | FD60 | 50.53 | ||
7 | 985.0964 | Space 2 | 51.90 | |||
8 | −1806.9340 | 12.90000 | FCD1 | 63.83 | ||
9 | −119.5506 | 12.76572 | 66.37 | |||
10 | −78.5134 | 6.00000 | FD5 | 68.04 | ||
11 | 182.0865 | 13.50000 | FCD1 | 76.59 | ||
12 | −155.7738 | 0.10000 | 79.19 | |||
13 | 143.0293 | 16.40000 | FCD1 | 86.91 | ||
14 | −185.9051 | 33.71327 | 87.70 | |||
15 | 121.7684 | 19.33261 | FCD1 | 89.21 | ||
16 | −165.2038 | 1.22690 | 88.11 | |||
17 | −274.4370 | 9.00000 | FEL6 | 85.52 | ||
18 | 232.5454 | 8.00000 | 80.76 | |||
19 | a | −1162.4850 | 11.00000 | ACRYLIC | 80.29 | |
20 | −250.2591 | Space 3 | 80.19 | |||
21 | ∞ | 17.00000 | 75.54 | |||
22 | ∞ | 55.00000 | BSC7 | 72.41 | ||
23 | ∞ | 32580.94922 | 65.76 | |||
24 | Aper. stop | −32580.94922 | 12022.52 | |||
25 | ∞ | 0.00000 | 65.76 | |||
26 | ∞ | 2.50000 | BSC7 | 65.76 | ||
27 | ∞ | Image distance | 65.46 | |||
Symbol Description |
a - Polynomial asphere |
c - Conic section |
Even Polynomial Aspheres and Conic Constants |
Surf. | ||||||||
No. | k | D | E | F | G | H | I | |
1 | 7.6142E − 08 | 2.1400E − 11 | 3.5721E − 15 | −1.8127E − 19 | −2.7585E − 22 | 4.2049E − 26 | ||
2 | −1.2000E + 00 | 6.9750E − 07 | 1.5171E − 10 | −3.5735E − 14 | 2.2817E − 17 | 1.1872E − 20 | −4.3252E − 24 | |
19 | −7.1999E − 07 | −2.8786E − 11 | −2.5403E − 14 | 1.0105E − 17 | 9.9122E − 22 | −1.2757E − 24 | ||
Variable Spaces |
Zoom/Focus | Space 1 | Space 2 | Space 3 | Focal | Image | |
Pos. | T(5) | T(7) | T(20) | Shift | Distance | |
1 | 78.798 | 27.949 | 20.652 | −0.048 | 0.399 | |
2 | 41.563 | 27.949 | 32.019 | −0.060 | 0.400 | |
3 | 9.348 | 27.949 | 46.123 | −0.054 | 0.400 | |
4 | 78.798 | 28.761 | 19.841 | −0.058 | 0.402 | |
5 | 9.348 | 29.097 | 44.975 | −0.033 | 0.399 | |
6 | 78.798 | 27.436 | 21.164 | −0.052 | 0.398 | |
7 | 9.348 | 27.006 | 47.066 | −0.071 | 0.400 | |
POS 1 System First Order Properties |
OBJ. HT: −1500.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11785. |
EFL: 51.1386 | FVD: 446.519 | ENP: 67.4777 | ||
IMD: 0.399020 | BRL: 446.120 | EXP: 32579.3 | ||
OBD: −2256.93 | OVL: 2703.44 | |||
POS 2 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11532. |
EFL: 61.0036 | FVD: 420.651 | ENP: 58.7259 | ||
IMD: 0.399612 | BRL: 420.252 | EXP: 32579.3 | ||
OBD: −2714.05 | OVL: 3134.70 | |||
POS 3 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11282. |
EFL: 73.2246 | FVD: 402.540 | ENP: 47.8756 | ||
IMD: 0.399977 | BRL: 402.140 | EXP: 32579.3 | ||
OBD: −3280.35 | OVL: 3682.89 | |||
POS 4 System First Order Properties |
OBJ. HT: −4800.0 | f/ 2.81 MAG: | −0.0064 |
STOP: 0.00 after surface 24. DIA: −11784. |
EFL: 51.1401 | FVD: 446.523 | ENP: 67.6082 | ||
IMD: 0.401728 | BRL: 446.121 | EXP: 32579.3 | ||
OBD: −7922.95 | OVL: 8369.47 | |||
POS 5 System First Order Properties |
OBJ. HT: −4640.0 | f/ 2.81 MAG: | −0.0066 |
STOP: 0.00 after surface 24. DIA: −11279. |
EFL: 73.0988 | FVD: 402.538 | ENP: 48.2536 | ||
IMD: 0.398550 | BRL: 402.140 | EXP: 32579.3 | ||
OBD: −11027.2 | OVL: 11429.7 | |||
POS 6 System First Order Properties |
OBJ. HT: −960.00 | f/ 2.81 MAG: | −0.0321 |
STOP: 0.00 after surface 24. DIA: −11786. |
EFL: 51.1377 | FVD: 446.518 | ENP: 67.3953 | ||
IMD: 0.398357 | BRL: 446.119 | EXP: 32579.3 | ||
OBD: −1525.60 | OVL: 1972.12 | |||
POS 7 System First Order Properties |
OBJ. HT: −890.00 | f/ 2.93 MAG: | −0.0346 |
STOP: 0.00 after surface 24. DIA: −11285. |
EFL: 73.3284 | FVD: 402.541 | ENP: 47.5641 | ||
IMD: 0.400345 | BRL: 402.140 | EXP: 32579.3 | ||
OBD: −2071.59 | OVL: 2474.13 | |||
First−Order Data |
Zoom/Focus Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
f/number | 2.81 | 2.87 | 2.93 | 2.81 | 2.93 | 2.81 | 2.93 |
Magnification | −0.0220 | −0.0220 | −0.0220 | −0.0064 | −0.0066 | −0.0321 | −0.0346 |
Object Height | −1500.0 | −1400.0 | −1400.0 | −4800.0 | −4640.0 | −960.00 | −890.00 |
Object Distance | −2256.9 | −2714.1 | −3280.4 | −7923.0 | −11027. | −1525.6 | −2071.6 |
Effective Focal Length | 51.139 | 61.004 | 73.225 | 51.140 | 73.099 | 51.138 | 73.328 |
Image Distance | 0.39902 | 0.39961 | 0.39998 | 0.40173 | 0.39855 | 0.39836 | 0.40034 |
Overall Length | 2703.4 | 3134.7 | 3682.9 | 8369.5 | 11430. | 1972.1 | 2474.1 |
Forward Vertex Distance | 446.52 | 420.65 | 402.54 | 446.52 | 402.54 | 446.52 | 402.54 |
Barrel Length | 446.12 | 420.25 | 402.14 | 446.12 | 402.14 | 446.12 | 402.14 |
Stop Surface Number | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
Distance to Stop | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Stop Diameter | −11785.247 | −11532.072 | −11282.355 | −11783.909 | −11278.769 | −11786.057 | −11285.433 |
Entrance Pupil Distance | 67.478 | 58.726 | 47.876 | 67.608 | 48.254 | 67.395 | 47.564 |
Exit Pupil Distance | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. |
First Order Properties of Elements |
Element | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 2 | −0.85362E − 02 | −117.15 | |
2 | 3 | 4 | −0.94733E − 02 | −105.56 | |
3 | 4 | 5 | 0.81220E − 02 | 123.12 | |
4 | 6 | 7 | 0.39684E − 02 | 251.99 | |
5 | 8 | 9 | 0.39034E − 02 | 256.19 | |
6 | 10 | 11 | −0.12467E − 01 | −80.209 | |
7 | 11 | 12 | 0.58583E − 02 | 170.70 | |
8 | 13 | 14 | 0.60639E − 02 | 164.91 | |
9 | 15 | 16 | 0.69513E − 02 | 143.86 | |
10 | 17 | 18 | −0.42708E − 02 | −234.15 | |
11 | 19 | 20 | 0.15545E − 02 | 643.31 | |
First−Order Properties of Doublets |
Element | Surface | ||||||
Numbers | Numbers | Power | f′ | ||||
2 | 3 | 3 | 5 | −0.99328E − 03 | −1006.8 | |||
6 | 7 | 10 | 12 | −0.60688E − 02 | −164.78 | |||
First Order Properties of Groups |
Group | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 5 | −0.98030E − 02 | −102.01 | |
2 | 6 | 7 | 0.39684E − 02 | 251.99 | |
3 | 8 | 20 | 0.78383E − 02 | 127.58 | |
First Order Properties of the Lens |
Zoom/Focus Position | |||
Number | Power | f′ | |
1 | 0.19555E − 01 | 51.139 | |
2 | 0.16392E − 01 | 61.004 | |
3 | 0.13657E − 01 | 73.225 | |
4 | 0.19554E − 01 | 51.140 | |
5 | 0.13680E − 01 | 73.099 | |
6 | 0.19555E − 01 | 51.138 | |
7 | 0.13637E − 01 | 73.328 | |
TABLE 3 | ||||||
Surf. | Clear Aperture | |||||
No. | Type | Radius | Thickness | Glass | Diameter | |
1 | a | 302.1309 | 9.00000 | ACRYLIC | 104.09 | |
2 | ac | 47.4329 | 78.37469 | 81.77 | ||
3 | −70.3606 | 4.10000 | FCD1 | 52.72 | ||
4 | 272.0798 | 7.00000 | TAF3 | 52.85 | ||
5 | −161.8160 | Space 1 | 52.77 | |||
6 | 156.5210 | 8.14000 | FD60 | 54.31 | ||
7 | 730.4220 | Space 2 | 55.33 | |||
8 | −1473.8400 | 9.00000 | FCD1 | 66.20 | ||
9 | −119.4897 | 13.46569 | 67.52 | |||
10 | −78.2719 | 6.00000 | FD5 | 69.04 | ||
11 | 162.3287 | 13.50000 | FCD1 | 77.92 | ||
12 | −162.3287 | 0.10000 | 80.18 | |||
13 | 137.3497 | 17.00000 | FCD1 | 88.34 | ||
14 | −175.1294 | 35.71132 | 89.01 | |||
15 | 114.2469 | 19.00000 | FCD1 | 88.81 | ||
16 | −160.1066 | 0.78711 | 87.72 | |||
17 | −221.1460 | 8.00000 | FEL6 | 85.59 | ||
18 | 221.1460 | 8.62819 | 80.38 | |||
19 | a | −1075.3290 | 9.00000 | ACRYLIC | 79.76 | |
20 | −260.9656 | Space 3 | 79.58 | |||
21 | ∞ | 17.00000 | 75.55 | |||
22 | ∞ | 55.00000 | BSC7 | 72.42 | ||
23 | ∞ | 32580.94922 | 65.78 | |||
24 | Aper. stop | −32580.94922 | 12031.11 | |||
25 | ∞ | 0.00000 | 65.78 | |||
26 | ∞ | 2.50000 | BSC7 | 65.78 | ||
27 | ∞ | Image distance | 65.48 | |||
Symbol Description |
a - Polynomial asphere |
c - Conic section |
Even Polynomial Aspheres and Conic Constants |
Surf. | ||||||||
No. | k | D | E | F | G | H | I | |
1 | −8.2781E − 08 | 4.5513E − 11 | 6.6948E − 15 | −9.6646E − 19 | −7.5403E − 22 | 1.1147E − 25 | ||
2 | −1.2000E + 00 | 4.5209E − 07 | 7.3282E − 11 | −1.1459E − 14 | 3.5740E − 17 | 1.0182E − 20 | −9.0498E − 24 | |
19 | −7.8117E − 07 | −3.8380E − 11 | −2.2648E − 14 | 8.6573E − 18 | 1.8343E − 21 | −1.6207E − 24 | ||
Variable Spaces |
Zoom/Focus | Space 1 | Space 2 | Space 3 | Focal | Image | |
Pos. | T(5) | T(7) | T(20) | Shift | Distance | |
1 | 78.865 | 27.019 | 18.928 | −0.059 | 0.398 | |
2 | 40.861 | 27.019 | 29.970 | −0.071 | 0.399 | |
3 | 12.269 | 27.019 | 41.546 | −0.075 | 0.400 | |
4 | 78.865 | 27.840 | 18.111 | −0.071 | 0.403 | |
5 | 12.269 | 28.109 | 40.454 | −0.053 | 0.399 | |
6 | 78.865 | 26.507 | 19.440 | −0.065 | 0.398 | |
7 | 12.269 | 26.116 | 42.449 | −0.086 | 0.400 | |
POS 1 System First Order Properties |
OBJ. HT: −1500.0 | f/ 2.81 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11788. |
EFL: 51.1920 | FVD: 446.517 | ENP: 67.4879 | ||
IMD: 0.398173 | BRL: 446.119 | EXP: 32579.3 | ||
OBD: −2259.34 | OVL: 2705.86 | |||
POS 2 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.87 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11534. |
EFL: 60.9989 | FVD: 419.557 | ENP: 58.5814 | ||
IMD: 0.399452 | BRL: 419.157 | EXP: 32579.3 | ||
OBD: −2713.98 | OVL: 3133.54 | |||
POS 3 System First Order Properties |
OBJ. HT: −1400.0 | f/ 2.93 MAG: | −0.0220 |
STOP: 0.00 after surface 24. DIA: −11285. |
EFL: 71.2712 | FVD: 402.541 | ENP: 49.2460 | ||
IMD: 0.400403 | BRL: 402.140 | EXP: 32579.3 | ||
OBD: −3190.20 | OVL: 3592.74 | |||
POS 4 System First Order Properties |
OBJ. HT: −4800.0 | f/ 2.81 MAG: | −0.0064 |
STOP: 0.00 after surface 24. DIA: −11787. |
EFL: 51.2062 | FVD: 446.525 | ENP: 67.6122 | ||
IMD: 0.403203 | BRL: 446.122 | EXP: 32579.3 | ||
OBD: −7933.27 | OVL: 8379.80 | |||
POS 5 System First Order Properties |
OBJ. HT: −4640.0 | f/ 2.93 MAG: | −0.0066 |
STOP: 0.00 after surface 24. DIA: −11282. |
EFL: 71.1979 | FVD: 402.538 | ENP: 49.5662 | ||
IMD: 0.398532 | BRL: 402.139 | EXP: 32579.3 | ||
OBD: −10737.8 | OVL: 11140.4 | |||
POS 6 System First Order Properties |
OBJ. HT: −960.00 | f/ 2.81 MAG: | −0.0321 |
STOP: 0.00 after surface 24. DIA: −11789. |
EFL: 51.1831 | FVD: 446.517 | ENP: 67.4104 | ||
IMD: 0.397928 | BRL: 446.119 | EXP: 32579.3 | ||
OBD: −1527.00 | OVL: 1973.52 | |||
POS 7 System First Order Properties |
OBJ. HT: −890.00 | f/ 2.93 MAG: | −0.0346 |
STOP: 0.00 after surface 24. DIA: −11288. |
EFL: 71.3321 | FVD: 402.541 | ENP: 48.9803 | ||
IMD: 0.400167 | BRL: 402.140 | EXP: 32579.3 | ||
OBD: −2012.48 | OVL: 2415.02 | |||
First−Order Data |
Zoom/Focus Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
f/number | 2.81 | 2.87 | 2.93 | 2.81 | 2.93 | 2.81 | 2.93 |
Magnification | −0.0220 | −0.0220 | −0.0220 | −0.0064 | −0.0066 | −0.0321 | −0.0346 |
Object Height | −1500.0 | −1400.0 | −1400.0 | −4800.0 | −4640.0 | −960.00 | −890.00 |
Object Distance | −2259.3 | −2714.1 | −3190.2 | −7933.3 | −10738. | −1527.0 | −2012.5 |
Effective Focal Length | 51.192 | 60.999 | 71.271 | 51.206 | 71.198 | 51.183 | 71.332 |
Image Distance | 0.39817 | 0.39945 | 0.40040 | 0.40320 | 0.39853 | 0.39793 | 0.40017 |
Overall Length | 2705.9 | 3133.5 | 3592.7 | 8379.8 | 11140. | 1973.5 | 2415.0 |
Forward Vertex Distance | 446.52 | 419.56 | 402.54 | 446.53 | 402.54 | 446.52 | 402.54 |
Barrel Length | 446.12 | 419.16 | 402.14 | 446.12 | 402.14 | 446.12 | 402.14 |
Stop Surface Number | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
Distance to Stop | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Stop Diameter | −11787.868 | −11534.243 | −11285.378 | −11786.588 | −11282.079 | −11788.625 | −11288.220 |
Entrance Pupil Distance | 67.488 | 58.581 | 49.246 | 67.612 | 49.566 | 67.410 | 48.980 |
Exit Pupil Distance | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. | 32579. |
First Order Properties of Elements |
Element | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 2 | −0.86732E − 02 | −115.30 | |
2 | 3 | 4 | −0.89517E − 02 | −111.71 | |
3 | 4 | 5 | 0.79087E − 02 | 126.44 | |
4 | 6 | 7 | 0.41052E − 02 | 243.59 | |
5 | 8 | 9 | 0.38418E − 02 | 260.30 | |
6 | 10 | 11 | −0.12961E − 01 | −77.152 | |
7 | 11 | 12 | 0.60563E − 02 | 165.12 | |
8 | 13 | 14 | 0.63580E − 02 | 157.28 | |
9 | 15 | 16 | 0.73039E − 02 | 136.91 | |
10 | 17 | 18 | −0.48626E − 02 | −205.65 | |
11 | 19 | 20 | 0.14382E − 02 | 695.33 | |
First−Order Properties of Doublets |
Element | Surface | ||||||
Numbers | Numbers | Power | f′ | ||||
2 | 3 | 3 | 5 | −0.71667E − 03 | −1395.3 | |||
6 | 7 | 10 | 12 | −0.63590E − 02 | −157.26 | |||
First Order Properties of Groups |
Group | Surface | ||||
Number | Numbers | Power | f′ | ||
1 | 1 | 5 | −0.95572E − 02 | −104.63 | |
2 | 6 | 7 | 0.41052E − 02 | 243.59 | |
3 | 8 | 20 | 0.76042E − 02 | 131.51 | |
First Order Properties of the Lens |
Zoom/Focus Position | |||
Number | Power | f′ | |
1 | 0.19534E − 01 | 51.192 | |
2 | 0.16394E − 01 | 60.999 | |
3 | 0.14031E − 01 | 71.271 | |
4 | 0.19529E − 01 | 51.206 | |
5 | 0.14045E − 01 | 71.198 | |
6 | 0.19538E − 01 | 51.183 | |
7 | 0.14019E − 01 | 71.332 | |
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/383,778 US6169636B1 (en) | 1999-05-04 | 1999-08-26 | Focus corrector for zoom projection lenses used with pixelized panels |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/304,693 US6195209B1 (en) | 1999-05-04 | 1999-05-04 | Projection lenses having reduced lateral color for use with pixelized panels |
US09/383,778 US6169636B1 (en) | 1999-05-04 | 1999-08-26 | Focus corrector for zoom projection lenses used with pixelized panels |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/304,693 Continuation-In-Part US6195209B1 (en) | 1999-05-04 | 1999-05-04 | Projection lenses having reduced lateral color for use with pixelized panels |
Publications (1)
Publication Number | Publication Date |
---|---|
US6169636B1 true US6169636B1 (en) | 2001-01-02 |
Family
ID=23177580
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/304,693 Expired - Lifetime US6195209B1 (en) | 1999-05-04 | 1999-05-04 | Projection lenses having reduced lateral color for use with pixelized panels |
US09/383,778 Expired - Lifetime US6169636B1 (en) | 1999-05-04 | 1999-08-26 | Focus corrector for zoom projection lenses used with pixelized panels |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/304,693 Expired - Lifetime US6195209B1 (en) | 1999-05-04 | 1999-05-04 | Projection lenses having reduced lateral color for use with pixelized panels |
Country Status (7)
Country | Link |
---|---|
US (2) | US6195209B1 (en) |
EP (1) | EP1181610A4 (en) |
JP (1) | JP2002543468A (en) |
KR (1) | KR100722594B1 (en) |
CN (1) | CN1131450C (en) |
TW (1) | TW444134B (en) |
WO (1) | WO2000067059A1 (en) |
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US20040130799A1 (en) * | 2003-01-07 | 2004-07-08 | Kreitzer Melvyn H. | Folded, telecentric projection lenses for use with pixelized panels |
US20060109564A1 (en) * | 2004-11-17 | 2006-05-25 | Akira Sawamoto | Projection zoom lens and projector |
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Publication number | Publication date |
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CN1131450C (en) | 2003-12-17 |
TW444134B (en) | 2001-07-01 |
CN1352753A (en) | 2002-06-05 |
US6195209B1 (en) | 2001-02-27 |
WO2000067059A1 (en) | 2000-11-09 |
EP1181610A2 (en) | 2002-02-27 |
KR100722594B1 (en) | 2007-05-28 |
WO2000067059A8 (en) | 2001-04-12 |
JP2002543468A (en) | 2002-12-17 |
EP1181610A4 (en) | 2003-05-21 |
KR20020013866A (en) | 2002-02-21 |
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